Add a high time resolution tweak with default pattern

include/spdlog/details/pattern_formatter.h

@@ -498,8 +498,13 @@ class full_formatter final : public flag_formatter
         }
         fmt_helper::append_buf(cached_datetime_, dest);
 
+#ifdef SPDLOG_HIGH_RES
+        auto micros = fmt_helper::time_fraction<microseconds>(msg.time);
+        fmt_helper::pad6(static_cast<int>(micros.count()), dest);
+#else
         auto millis = fmt_helper::time_fraction<milliseconds>(msg.time);
         fmt_helper::pad3(static_cast<int>(millis.count()), dest);
+#endif
         dest.push_back(']');
         dest.push_back(' ');
 

include/spdlog/tweakme.h

@@ -61,6 +61,13 @@
 // #define SPDLOG_NO_NAME
 ///////////////////////////////////////////////////////////////////////////////
 
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to make default pattern replace milliseconds with microseconds on
+// tail.
+//
+// #define SPDLOG_HIGH_RES
+///////////////////////////////////////////////////////////////////////////////
+
 ///////////////////////////////////////////////////////////////////////////////
 // Uncomment to enable the SPDLOG_DEBUG/SPDLOG_TRACE macros.
 //